You seriously think that NO ONE has ever thrown a vicious elbow in a streetball game? Keep in mind, a lot of these guys play for hours every day, especially during the summer. For that, they probably take MORE elbows in three months than NBA players do in an entire season. Also, NBA players get easier foul calls. You have to kill someone in streetball to get a foul.
Of course there's elbows and agressive play. The difference is street ball doesn't have players the size of a Shaq, or Ben Wallace.